Steven Moffat has upheld Doctor Who tradition by changing back the door of the Tardis.

According to Metro, the sci-fi drama's executive producer is responsible for the return of the St John Ambulance badge on the front of the iconic police box.

It had not appeared in 40 years, dating back to William Hartnell and Patrick Troughton's Time Lord during the 1960s and 1970s.

"Steven wanted to stamp his own mark on the exterior as well as the interior, and he's a big fan of the Peter Cushing movie version, so readded the logo," a source said.

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Meanwhile, a spokesman for the show revealed: "The Tardis has changed many times throughout Doctor Who's history, and we have been really happy with the great reception that the new Tardis interior and exterior have received from fans."